// Copyright 2017 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
////////////////////////////////////////////////////////////////////////////////

package com.google.crypto.tink.daead;

import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.assertEquals;

import com.google.crypto.tink.TinkProtoParametersFormat;
import com.google.crypto.tink.proto.AesSivKeyFormat;
import com.google.crypto.tink.proto.KeyTemplate;
import com.google.crypto.tink.proto.OutputPrefixType;
import com.google.protobuf.ExtensionRegistryLite;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests for DeterministicAeadKeyTemplates. */
@RunWith(JUnit4.class)
public class DeterministicAeadKeyTemplatesTest {
  @BeforeClass
  public static void setUp() throws Exception {
    DeterministicAeadConfig.register();
  }

  @Test
  public void aes256Siv() throws Exception {
    KeyTemplate template = DeterministicAeadKeyTemplates.AES256_SIV;
    assertEquals(new AesSivKeyManager().getKeyType(), template.getTypeUrl());
    assertEquals(OutputPrefixType.TINK, template.getOutputPrefixType());
    AesSivKeyFormat format =
        AesSivKeyFormat.parseFrom(template.getValue(), ExtensionRegistryLite.getEmptyRegistry());

    assertEquals(64, format.getKeySize());
  }

  @Test
  public void testCreateAesSivKeyTemplate() throws Exception {
    // Intentionally using "weird" or invalid values for parameters,
    // to test that the function correctly puts them in the resulting template.
    int keySize = 42;
    KeyTemplate template = DeterministicAeadKeyTemplates.createAesSivKeyTemplate(keySize);
    assertEquals(new AesSivKeyManager().getKeyType(), template.getTypeUrl());
    assertEquals(OutputPrefixType.TINK, template.getOutputPrefixType());
    AesSivKeyFormat format =
        AesSivKeyFormat.parseFrom(template.getValue(), ExtensionRegistryLite.getEmptyRegistry());

    assertEquals(keySize, format.getKeySize());
  }

  @Test
  public void testAesSivParametersEqualsKeyTemplate() throws Exception {
    assertThat(
            TinkProtoParametersFormat.parse(DeterministicAeadKeyTemplates.AES256_SIV.toByteArray()))
        .isEqualTo(PredefinedDeterministicAeadParameters.AES256_SIV);
  }
}
